STUDIES ON THE MECHANISM OF GROWTH INHIBITING EFFECT OF LIGHT |
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Authors: | SHIBAOKA HIROH |
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Institution: | Biological Institute, College of General Education (Kyoyo.Gakubu), University of Tokyo Tokyo |
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Abstract: | - A substance which inhibits indoleacetic acid (IAA)-and naphthaleneaceticacid (NAA)-induced elongation of Avena coleoptile section andIAA-induced Avena coleoptile curvature was found in an ethersoluble neutral fraction of water extract of sunflower leavesand in agar blocks containing the diffusate from young sunflowerleaves.
- This substance also inhibits the growth of isolatedsunflowerepicotyl.
- The Rf value (0.9) of the substance ona paper chromatogramdeveloped with ammoniacal iso-propanolindicates that it isidentical with the inhibitor reported byAUDUS et al. (1956),but not with inhibitor-ß.
- Theinhibitor can be transported from leaf to stem, and thetransportseems to be accelerated by illuminating the leaf.
- The auxindiffused from sunflower leaf into agar block may beidenticalwith IAA.
- A substance, which has the same properties as theinhibitorfrom sunflower leaf, was obtained in crystalline formfrom theleaf of Jerusalem artichoke.
- The mechanism of growthinhibition caused by this crystallinesubstance seems to involveinactivation of a sulfhydryl group.
- The reason why the stemgrowth of sunflower seedlings is reducedby strong light isdiscussed: the amount of the inhibitor transportedfrom leafto stem is increased under strong light, and in thestem, growthinhibition is caused by a direct effect of thisinhibitor ongrowth and by its inhibiting effect on the transportof IAAfrom leaf to stem.
1 Present address: Botanical Garden, Faculty of Science, Universityof Tokyo, Tokyo (Received February 15, 1961; ) |
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